Year	% (modeled ILO estimate)
1991	33.488
1992	33.906
1993	34.227
1994	34.494
1995	34.756
1996	35.048
1997	35.295
1998	35.534
1999	35.731
2000	35.914
2001	36.064
2002	36.277
2003	36.376
2004	36.442
2005	36.575
2006	36.718
2007	36.814
2008	36.874
2009	36.928
2010	36.995
2011	37.234
2012	37.347
2013	38.124
2014	38.915
2015	39.723
2016	40.546
2017	41.383
2018	42.231
2019	42.041
2020	41.26
2021	41.18
2022	40.894
2023	41.084